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1 | /* -*- linux-c -*- ------------------------------------------------------- * |
2 | * | |
3 | * Copyright 2002 H. Peter Anvin - All Rights Reserved | |
4 | * Copyright 2012 Tilera Corporation - All Rights Reserved | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation, Inc., 53 Temple Place Ste 330, | |
9 | * Boston MA 02111-1307, USA; either version 2 of the License, or | |
10 | * (at your option) any later version; incorporated herein by reference. | |
11 | * | |
12 | * ----------------------------------------------------------------------- */ | |
13 | ||
14 | /* | |
15 | * tilegx$#.c | |
16 | * | |
17 | * $#-way unrolled TILE-Gx SIMD for RAID-6 math. | |
18 | * | |
19 | * This file is postprocessed using unroll.awk. | |
20 | * | |
21 | */ | |
22 | ||
23 | #include <linux/raid/pq.h> | |
24 | ||
25 | /* Create 8 byte copies of constant byte */ | |
26 | # define NBYTES(x) (__insn_v1addi(0, x)) | |
27 | # define NSIZE 8 | |
28 | ||
29 | /* | |
30 | * The SHLBYTE() operation shifts each byte left by 1, *not* | |
31 | * rolling over into the next byte | |
32 | */ | |
33 | static inline __attribute_const__ u64 SHLBYTE(u64 v) | |
34 | { | |
35 | /* Vector One Byte Shift Left Immediate. */ | |
36 | return __insn_v1shli(v, 1); | |
37 | } | |
38 | ||
39 | /* | |
40 | * The MASK() operation returns 0xFF in any byte for which the high | |
41 | * bit is 1, 0x00 for any byte for which the high bit is 0. | |
42 | */ | |
43 | static inline __attribute_const__ u64 MASK(u64 v) | |
44 | { | |
45 | /* Vector One Byte Shift Right Signed Immediate. */ | |
46 | return __insn_v1shrsi(v, 7); | |
47 | } | |
48 | ||
49 | ||
50 | void raid6_tilegx$#_gen_syndrome(int disks, size_t bytes, void **ptrs) | |
51 | { | |
52 | u8 **dptr = (u8 **)ptrs; | |
53 | u64 *p, *q; | |
54 | int d, z, z0; | |
55 | ||
56 | u64 wd$$, wq$$, wp$$, w1$$, w2$$; | |
57 | u64 x1d = NBYTES(0x1d); | |
58 | u64 * z0ptr; | |
59 | ||
60 | z0 = disks - 3; /* Highest data disk */ | |
61 | p = (u64 *)dptr[z0+1]; /* XOR parity */ | |
62 | q = (u64 *)dptr[z0+2]; /* RS syndrome */ | |
63 | ||
64 | z0ptr = (u64 *)&dptr[z0][0]; | |
65 | for ( d = 0 ; d < bytes ; d += NSIZE*$# ) { | |
66 | wq$$ = wp$$ = *z0ptr++; | |
67 | for ( z = z0-1 ; z >= 0 ; z-- ) { | |
68 | wd$$ = *(u64 *)&dptr[z][d+$$*NSIZE]; | |
69 | wp$$ = wp$$ ^ wd$$; | |
70 | w2$$ = MASK(wq$$); | |
71 | w1$$ = SHLBYTE(wq$$); | |
72 | w2$$ = w2$$ & x1d; | |
73 | w1$$ = w1$$ ^ w2$$; | |
74 | wq$$ = w1$$ ^ wd$$; | |
75 | } | |
76 | *p++ = wp$$; | |
77 | *q++ = wq$$; | |
78 | } | |
79 | } | |
80 | ||
81 | const struct raid6_calls raid6_tilegx$# = { | |
82 | raid6_tilegx$#_gen_syndrome, | |
fe5cbc6e | 83 | NULL, /* XOR not yet implemented */ |
ae77cbc1 KS |
84 | NULL, |
85 | "tilegx$#", | |
86 | 0 | |
87 | }; |